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Finding the Fourth Proportional to 20,487.80, 30,731.70 and 18,738.20

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Solution

The fourth proportional to 20,487.80, 30,731.70 and 18,738.20 is: 28,107.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,487.80 : 30,731.70 = 18,738.20 : x
  2. Step 2: Convert to fraction form
    20,487.80/30,731.70 = 18,738.20/x
  3. Step 3: Cross multiply
    20,487.80x = 30,731.70 × 18,738.20
  4. Step 4: Simplify right side
    20,487.80x = 575,856,740.94
  5. Step 5: Solve for x
    x = 575,856,740.94/20,487.80
  6. Step 6: Final answer
    x = 28,107.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.